161615628 has 48 divisors (see below), whose sum is σ = 422338560. Its totient is φ = 53443152.

The previous prime is 161615599. The next prime is 161615633. The reversal of 161615628 is 826516161.

161615628 is a `hidden beast` number, since 1 + 6 + 16 + 15 + 628 = 666.

It is a super-2 number, since 2×161615628² = 52239222427668768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161615592 and 161615601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7825 + ... + 19607.

It is an arithmetic number, because the mean of its divisors is an integer number (8798720).

Almost surely, 2^161615628 is an apocalyptic number.

161615628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161615628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211169280).

161615628 is an abundant number, since it is smaller than the sum of its proper divisors (260722932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161615628 is a wasteful number, since it uses less digits than its factorization.

161615628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11923 (or 11915 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 161615628 is about 12712.8135359565. The cubic root of 161615628 is about 544.7046942679.

The spelling of 161615628 in words is "one hundred sixty-one million, six hundred fifteen thousand, six hundred twenty-eight".